Specifications

Appendix D
– 95 – PCI-1710 series User’s Manual
Advantech Co., Ltd.
www.advantech.com
M2, M1 & M0 Select operating mode
M2 M1 M0 Mode Description
0 0 0 0 Stop on terminal count
0 0 1 1 Programmable one shot
X 1 0 2 Rate generator
X 1 1 3 Square wave rate generator
1 0 0 4 Software triggered strobe
1 0 1 5 Hardware triggered strobe
BCD Select binary or BCD counting
BCD Type
0 Binary counting 16-bits
1 Binary coded decimal (BCD) counting
If you set the module for binary counting, the count can be any
number from 0 up to 65535. If you set it for BCD (Binary Coded
Decimal) counting, the count can be any number from 0 to 9999.
If you set both SC1 and SC0 bits to 1, the counter control register is in
read-back command mode. The control register data format then
becomes:
BASE + 30(Dec) 82C54 control, read-back mode
Bit D7 D6 D5 D4 D3 D2 D1 D0
Value 1 1 CNT STA C2 C1 C0 X
CNT = 0 Latch count of selected counter(s)
STA = 0 Latch status of selected counter(s)
C2, C1 & C0 Select counter for a read-back operation
C2 = 1 select Counter 2
C1 = 1 select Counter 1
C0 = 1 select Counter 0
If you set both SC1 and SC0 to 1 and STA to 0, the register selected by
C2 to C0 contains a byte which shows the status of the counter. The
data format of the counter read/write register then becomes: